[SCSI] scsi_transport_srp: remove tgt dependencies

it's better to remove tgt dependencies in srp transport class since
most people want only initiator support.
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

drivers/scsi/Kconfig

@@ -291,11 +291,18 @@ source "drivers/scsi/libsas/Kconfig"
 
 config SCSI_SRP_ATTRS
 	tristate "SRP Transport Attributes"
-	depends on SCSI && SCSI_TGT
+	depends on SCSI
 	help
 	  If you wish to export transport-specific information about
 	  each attached SRP device to sysfs, say Y.
 
+config SCSI_SRP_TGT_ATTRS
+	bool "SCSI target support for SRP Transport Attributes"
+	depends on SCSI_SRP_ATTRS
+	depends on SCSI_TGT = y || SCSI_TGT = SCSI_SRP_ATTRS
+	help
+		If you want to use SCSI target mode drivers enable this option.
+
 endmenu
 
 menuconfig SCSI_LOWLEVEL
@@ -848,7 +855,7 @@ config SCSI_IBMVSCSI
 
 config SCSI_IBMVSCSIS
 	tristate "IBM Virtual SCSI Server support"
-	depends on PPC_PSERIES && SCSI_TGT && SCSI_SRP && SCSI_SRP_ATTRS
+	depends on PPC_PSERIES && SCSI_SRP && SCSI_SRP_TGT_ATTRS
 	help
 	  This is the SRP target driver for IBM pSeries virtual environments.
 

drivers/scsi/scsi_transport_srp.c

@@ -30,7 +30,7 @@
 #include <scsi/scsi_host.h>
 #include <scsi/scsi_transport.h>
 #include <scsi/scsi_transport_srp.h>
-#include <scsi/scsi_tgt.h>
+#include "scsi_transport_srp_internal.h"
 
 struct srp_host_attrs {
 	atomic_t next_port_id;
@@ -223,7 +223,7 @@ struct srp_rport *srp_rport_add(struct Scsi_Host *shost,
 	}
 
 	if (ids->roles == SRP_RPORT_ROLE_INITIATOR) {
-		ret = scsi_tgt_it_nexus_create(shost, (unsigned long)rport,
+		ret = srp_tgt_it_nexus_create(shost, (unsigned long)rport,
 					      rport->port_id);
 		if (ret) {
 			device_del(&rport->dev);
@@ -251,7 +251,7 @@ void srp_rport_del(struct srp_rport *rport)
 	struct device *dev = &rport->dev;
 
 	if (rport->roles == SRP_RPORT_ROLE_INITIATOR)
-		scsi_tgt_it_nexus_destroy(dev_to_shost(dev->parent),
+		srp_tgt_it_nexus_destroy(dev_to_shost(dev->parent),
 					 (unsigned long)rport);
 
 	transport_remove_device(dev);

drivers/scsi/scsi_transport_srp_internal.h

+#include <scsi/scsi_tgt.h>
+
+#ifdef CONFIG_SCSI_SRP_TGT_ATTRS
+static inline int srp_tgt_it_nexus_create(struct Scsi_Host *shost, u64 itn_id,
+					  char *initiator)
+{
+	return scsi_tgt_it_nexus_create(shost, itn_id, initiator);
+}
+
+static inline int srp_tgt_it_nexus_destroy(struct Scsi_Host *shost, u64 itn_id)
+{
+	return scsi_tgt_it_nexus_destroy(shost, itn_id);
+}
+
+#else
+static inline int srp_tgt_it_nexus_create(struct Scsi_Host *shost, u64 itn_id,
+					  char *initiator)
+{
+	return 0;
+}
+static inline int srp_tgt_it_nexus_destroy(struct Scsi_Host *shost, u64 itn_id)
+{
+	return 0;
+}
+#endif